Thought I'd post some pictures of something I've been messing around with.
A mate built the frame and tried to get it working but not very successfully.
It's called a thumbnail shrinker. That's in reference to the die's and perhaps that if it has too long a stroke you'll shrink your own thumbnail.
Anyhow, after making various new bits for it and researching the dies shape and function. I finally gave it a go tonight. I need to raise the speed a bit but as you can see from the item in the photo it seemed to work pretty well. Now to make stretching tools for it!
Metal Shrinker/ Planisher
Metal Shrinker/ Planisher
Metal Shrinker/ Planisher
Metal Shrinker/ Planisher
Metal Shrinker/ Planisher
Metal Shrinker/ Planisher